Control Efficacy of Bacillus thuringiensis Tiny Microgranules on Maize Lepidopteran Pests

doi:10.16409/j.cnki.2095-039x.2022.01.002

Abstract

Abstract: Lepidopteran insects, including Spodoptera frugiperda, Ostrina furnacalis and Helicoverpa armigera are the most serious pests in summer maize production in Anhui Province. To explore the efficient and green control measures, two Bacillus thuringiensis (Bt) microgranules, G033A and PS3, were applied at early whorl and late whorl stage, respectively, to study the control effects on lepidopteran pests of maize, protective effects of young whorl leaves and yields of maize. The results showed that at the early whorl stage, the control effects of G033A microgranules on pests applied artificially was 71.62%, 77.18% and 81.54%, respectively, and PS3 microgranules was 75.00%, 83.73% and 86.91%, respectively. The protective effects of G033A microgranules on young whorl leaves were 59.42%, 68.86% and 71.72%, respectively, and PS3 microgranules were 65.08%, 72.64% and 75.50%, respectively, within 14 days. At the late whorl stage, the control effects of G033A microgranules applied by UAV on pests after treatment of 7 days was 76.90%, 81.22% and 86.02%, respectively, and PS3 microgranules was 81.71%, 84.89% and 89.20%, respectively, but the control effects reduced 14 days after application. The restoration rate of the maize yield loss was 5.17%, 7.07% and 9.09%, respectively, by using G033A microgranules, and 5.56%, 7.47% and 9.57%, respectively, by using PS3 microgranules. Compared with wet table powder, microgranules have longer effect period and better control efficiency. The control effects of PS3 microgranules higher than that of G033A microgranules at 7 and 14 days after treatment with the same dosage. In summary, the results suggested that G033A and PS3 microgranules have good control effects on maize lepidopteran pests and the recommended dosage for artificial application is 300―600 g/667 m² and that for UAV application is 1―2 kg/667 m².

Key words: microgranules, maize, lepidopteran pest, control effect

CLC Number:

S476

HU Fei, XU Tingting, SU Xianyan, HU Benjin, BI Sijia, TONG Qiang, XU Lina, ZHANG Jie, YUN Hui. Control Efficacy of Bacillus thuringiensis Tiny Microgranules on Maize Lepidopteran Pests[J]. Chinese Journal of Biological Control, 2023, 39(1): 46-53.

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